Lens-beveling attachment for lens-edge-grinding machines



Dec. 24, 1929. E. G. ROBINSON 1,740,551

LENS BEVELING ATTA CHMENT FOR LENS EDGE GRINDING MACHINES Filed May 9, 1925 2 Sheets-Sheet FIG. 2

Emma G. Ronnuox Quorum:

WAWUQ l lllrllll Ii lllllll Dec. 24, 1929. E. G. ROBINSON 1 LENS BEVELING ATTACHMENT FOR LENS EDGE GRINDING MACHINES Filed May 9, 1925 2 Sheets-Sheet 2 Emu G. Rosmwon Patented Dec. 24-, 19.2

STATE;

LENS-BEVELING ATTACHMENT FOR LENSEDGE-GRINDING MACHINES Application filed May a, 1525. Serial No. 29,254.

My invention relates to beveling the edges 01: lenses, after they have been brought to size and form in an edge grinding machine,

and the obj e -t of the improvement is to provide an attachment for that class of edging machines in which is horizontally journaled the usual grinding stone, against the edge of which the lenses are held in the chuck of the edging machine and slowly turned by suitable .mechanism, with forming means, so that the entire periphery of the lens may be presented to the rotating stone for grinding and forming; a further object of the improvement is to provide means by which the edging and 5 beveling of lenses may become one operation, as the beveling attachment may be thrown into operation before the edging operation is completed.

Other objects are, first, to have the attachan ment readily accessible for use and adjustments second, to provide aplurality of beveling wheels for the beveling of one or more lenses in one operation; third, to provide automatic means for rotating the beveling wheels when they contact with the lenses; fourth, automatic alignment of the wheels and work; iiit'th, to provide for automatic adjustment of wheels and work; sixth, to provide additional adjustment to take care of the continuous wear of the grinding wheels; and, seventh, to provide automatic means for maintaining contact and pressure.

I attain these objects by the mechanism shown in the accompanying drawings, in which Figure 1 is a side elevation of the attachment, in connection with a like view in diagram oi the essential parts oi the edging machine; the at.achment being shown in operative position, also in a hooked up position in dotted lines;

Fig. 2, is a plan view of the attachment, in connection with a like View in diagram of the essential parts of the edging machine;

Fig. 3, is a cross section on line AA, Fi

Fig. 4t, is a longitudinal section through the spindle bearings of the beveling wheels and drive wheel;

Fig. 5 is a longitudinal vertical section through an edging machine chuck showing how the lens is held and how the beveling wheel must shift laterally and vertically in grinding a non-circular toric lens.

Similar numerals refer to similar parts throughout the several views.

The lens edging grindstone 1, its shaft 2, the shaft-bearings 3, the shaft-bearing caps 4-, and the lens-chuck 5, constitute the essential parts of the edging machine shown in diagrar i. The small V grooved grinding wheels 6, located in front of and above the center of the edging stone 1, are the lens beveling wheels of the beveling attachment, being spaced apart to match up with the spacing of the lenses held in the chuck of the edging machine and are carried in clamped positions. The sleeve 7 carrying the beveling wheels, is slidably mounted by means of the long key 8 on the spindle 9, which also carries the friction drive wheel 10, set in fixed position on the spindle. The carrying arm 11, in the T end of which the spindle is journaled, has two pivot bearing arms 12 formed on the other end, being spaced apart, with the bearings lining up with each other, also being parallel with the spindle bearing 13 in the l end or" the carrying arm. The link block 1 has one end formed to lit closely between the arms 12 or the carrying arm to which it is connected by the pivot pin 15; the lower end of the link block has the arms 16 formed on its opposite sides; in the lower end of the arms are the pivot bearings 17, lining parallel with the pin 15 in the other end of the link; the upper part of the arms 16 form the stop lugs 18 on the sides of the link, limiting the relative movement of the arm and the link. The pins 19 set eccentric in the ends of the larger pin 20 form the pivot bearings for the lower end of the link. The pin 20 is a close friction fit in bearing cap 4: of the edging machine journal. The enlarged end of the pin 20, with the pin holes in its perifery, forms the means by which the eccentrically set pins 19 are adjusted to any desired position about the center of the pin 20. The tension spring 21 connected to the carrying arm 11 and the edging machine bearing cap 4:, maintains the contact pressure between the drive wheel 10 and the grinding stone 1, also between the beveling wheels (5 and the lenses 22. The fiat spring 23, the lower end of which is fixed to the bearing cap of the edging machine, holds the attachment out of engagement by means of the detent 24, and the shoulder 25 limits the backward movement of the arm 11 and the link 14 when the attachment is thrown up and back out of operation, swinging on the link pivots 16 and 17.

The operation of the device consists in pulling the attachment forward free of the spring detent 24 and lowering the beveling wheels into contact with the lenses. It is understood that the purpose of the plurality of beveling Wheels is to effect the simultaneous beveling of a 'plurality of lenses which, altho not shown in the drawings, are held in spaced relation in a chuck similar to the one shown holding a single lens in Fig. 5. The chuck, in holding a plurality of lenses, spaces them so that the edges to be beveled coincide with the grooves in the beveling wheels 6. Gravity iolds the wheels 6 in contact with the lenses while the-spring 21 pulls the friction wheel 10 into contact with the large edging stone 1. It will now be seen that the beveling wheels 6 will derive a rotary motion from the large grindstone thru the friction wheel 10 of approximately the same peripheral speed as the stone 1. Grinding action occurs from the fact that lenses 22 are rotated at a relatively slow speed and the edges of the lenses will be beveled as shown at 26 in Fig. 5 according to the angle in the groove 27.

It will also be seen from Fig. 5 that in grinding certain types and shapes of lenses the wheels 6 must follow the edges of the lenses in a lateral reciprocatory movement. This the wheels 6 are constrained to do because of the grooves 27 which ride the edges of the lenses but at the same time are free to follow the lateral motion because of the sliding key 8.

l/Vhat I claim is:

1. The combination of a bevel grinding device with an edge grinding machine which is adapted to grind a flat edge 011 a lens sub stantially at right angles to an axis through the center thereof, means attached to the edge grinding machine for holding the bevel grinding device in operation on the lens while it is being ground in the edging machine and means for holding the bevel grinding device out of operating engagement with the lens during the edge grinding operation when desired.

2. The combination of a bevel grinding device with an edge grinding machine which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the center thereof, for simultaneous edging and beveling a lens held in the edging machine, means for holding the bevel grinding device out of operation on the lens when desired, and means for simultaneously causing the rotation of the bevel grinding device into operation when said bevel grinding device is brought into engagement with the lens being ground by the edging machine.

3. In a lens edging machine, the combination of a bevel-grinding wheel with an edgegrinding wheel which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the center thereof, means for utilizing the power of the edgegrinding wheel for rotating the bevel-grinding wheel, means forholding the bevel-grind ing wheel in grinding engagement with the lens being ground by said edge-grinding wheel and means for holding the bevelgrinding wheel out of engagement with the lens when desired while the edge grinding on the lens is in progress.

4. In a lens edging machine, the combination of a bevel-grinding wheel with an edgegrinding wheel which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the center thereof, means for bringing the bevel-grinding wheel into grinding engagement with the lens being ground by the edge-grinding wheel, means for driving the bevel-grinding wheel while said wheel is in engagement with the lens and means for simultaneously disconnecting the driving means when'the bevelgrinding wheel is removed from engagement with the lens, and means for holding the bevel-grinding wheel out of engagement with the lens when desired while the edge grinding is in progress.

5. A bevel grinding attachment for a lens edge grinding machine which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the center thereof comprising a spindle, a bevel-grind ing wheel and a friction drive wheel mounted on said spindle, means attached to the edging machine for carrying the spindle in parallel alignment to the axis of the edge-grinding wheel and for simultaneously holding the friction drive wheel in peripheral contact with the edge-grinding wheel and the bevelgrinding wheel in grinding engagement with the lens being ground by the edge-grinding wheel and means for holding the attachment out of engagement with said lens and edgegrinding wheel when desired.

6. A bevel grinding attachment to a lens edge grinding machine which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the. center thereof comprising an arm, a link hingedly connecting one end of said arm to the edging machine, a spindle mounted in the other end of said arm, a bevel-grinding wheel slidably mounted on said spindle, a friction drive wheel carried by said spindle and arranged to rotate the bevel-grinding wheel, a spring arranged to hold the drive wheel in peripheral contact with the edge-grinding wheel when the attachment is in operation, a stop between the arm and the link and a detent engagable with the link to hold, in conjunction with said stop, the bevel-grinding wheel out of grinding engagement with the lens and the driving wheel out of contact with the edge grinding wheel when desired.

7. A bevel grinding attachment for a lens edge grinding machine which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the center thereof, arranged to swing in an orbital man ner about the edge-grinding wheel of the edging machine on a pivot fixed to the edging machine eccentric to the axis of the edge grinding wheel and comprising an arm, a link pivoted to the arm and connecting the arm to the eccentric pivot, a bevel-grinding wheel and a friction drive wheel rotatably mounted on and maintained by the arm axially parallel to and in the plane of rotation of the edgegrinding wheel, a spring arranged to hold the drive wheel in peripheral contact with the edge-grinding wheel and the bevel-grinding wheel in grinding engagement with the lens being ground by the edge grinding machine, a detent fixed to the edging machine engageable with the link and a stop between the link and the arm to hold the attachment in an inoperative position when desired, substantially in the manner described.

8. A bevel grinding attachment for a lens edge grinding machine which is adapted to grind a flat edge on a lens substantially at right angles to an axis through the center thereof, comprising an arm, a link pivoted to said arm and means fixed adjacent to the axis of the edge-grinding wheel for pivotally connecting the link to the edging machine, a spindle rotatably carried by the arm and held in parallel alignment with the axis of the edgegrinding wheel, a sleeve slidably keyed to the spindle, a plurality of peripherally V-grooved grinding wheels mounted thereon, a friction drive wheel of greater diameter than the V-grooved grinding wheels fixedly keyed to the spindle, a spring engaging the arm and the edging machine to draw the driving wheel into peripheral contact with the edge-grind in g wheel and the V-grooved grinding wheels into grinding engagement with the lenses being ground by the edging machine, a detent fixed to the edging machine engageable with the link and a stop between the link and the arm to hold the attachment in an inoperative position when desired, all substantially as described.

ERDIS Gr. ROBINSON. 

